Lubuntu is a good operating system for many old computers, but not for all of them. Some computers have too little horsepower or memory. A rule of thumb is that the computer should not be more than 10 years old.
Memory (RAM)
For advanced internet services like Google+, YouTube, Google Drive, and Facebook, your computer needs at least 1 GB of RAM.
For local programs like LibreOffice and simple browsing habits, your computer needs at least 512 MB of RAM.
Processor (CPU)
The minimum specification for CPU is Pentium 4 or Pentium M or AMD K8. Older processors are too slow and the AMD K7 has problems with Flash video.
- For a full list of issues and features common to Ubuntu, please refer to the Ubuntu release notes.
These are maintained by the Lubuntu team.
Head over here to get it.
This release is supported until July of 2023.